Superteams of 3 superstars have been a necessity since the early 80's at least.
Thing is, a lot of the early superteams were created via prosperous/well-organized teams fleecing lesser ones.
You have to remember in the early 80's the NBA, and basketball in general, was not the juggernaut it is today.
Guys like Auerbach and Jerry West and Jim Buss were ahead of the curve in treating their teams like a true business as opposed to a family sideshow like much of the NBA/ABA was up to that time.
The stakes are higher now. Even the Grizzlies are a billion dollar business.
The draft, amateur scouting, analytics, the nature of the salary cap, greater autonomy on the part of the players, and the fact that spectator sports have never been more popular means the front offices across the league have evened the playing field in terms of their knowledge and resources.
Less likely to see a future 1st round pick turn into Magic Johnson as teams are more educated and have more at stake.
Less likely to see fleece jobs in general in terms of NBA trades. (though of course they still happen)
The talent and amount of true superstars is the same as past eras imo, its just that now where before a superteam would often be created via drafting + a fleece now those same teams have to be created via player movement.
LeBron is an interesting case in that he was so good so early that the Cavs really didnt get the chance to draft someone of high enough caliber to compliment him and create sustainable success.
Now youve got to draft and develop your *** off to build a sustainable team, or be the Celtics and rape Billy King, because its less likely those godfather type offers will come around.